We do believe that the explosion was an intentional act.

我們認為，爆炸是一種故意的行為。

Fire officials reported taking three people to the hospital, but none were critically injured.

消防官兵報告說，有3人被送往醫院，但都沒有重傷。

Police reported seeing the vehicle when they responded to an emergency call of shots fired in the downtown tourist area early in the morning, without specifying what made it suspicious, Police said Circumstances about the motorhome prompted officers to call the bomb squad.

警方報告說，當他們迴應清晨在市中心旅遊區開槍的緊急呼叫時，看到了這輛車，但沒有具體說明是什麼讓它變得可疑，警方說，關於房車的情況促使警察打電話給炸彈小組。

The bomb squad was on the way when the explosion occurred, Andrew McCabe, a former deputy F FBI director, told CNN.

F聯邦調查局前副局長安德魯-麥凱佈告訴CNN，爆炸發生時，炸彈小組正在路上。

An explosion of this size would be investigated as a possible act of terrorism, whether domestic or foreign.

這種規模的爆炸將作為可能的恐怖主義行為進行調查，無論是國內還是國外。

Moments before the blast, police officers went door to door in nearby buildings to hustle residents to safety, police said.

警方說，在爆炸發生前的幾分鐘，警察在附近的樓房裡挨家挨戶地催促居民到安全地帶。

It was not immediately clear if anyone was inside the motor home when it exploded.

目前還不清楚爆炸時是否有人在汽車屋內。

Most of the buildings were closed, given the hour and Christmas holiday in the heart of the city.

考慮到時間和市中心的聖誕假期，大部分建築都關門了。